Method of making paperboard containers



Nov. 2l, 1944. c. F. KLEIN 2,363,425

METHOD OF MAKING PAPER BOARD CONTAINERS I Filed sept. 18, 194s s sheets-sneet i 4. v/ 34 I I I I I l I I I I l a w l l I I I fz-i. I I I I 1 im'r Nov, 21, 1,944.'A

c F. KLEIN METHOD OF MAKING PAPER BOARD CONTA'INERS Fired Sept. 18,y 1943 s sheets-sheet 2 Nov. 2l, 1944. c. F. KLEIN 2,363,425

METHOD 0F MAKING PAPER BOARD CONTAINERS Fired sept. 18, 194s 3 sheets-sheet :5 v

' in Fig. 1;

visual blank and Patentedv Nov. .21, 1944 uum'riao STATES PATENT oFFlci-z METHOD or MAKING rarmtnoanp CONTAINERS l Clarence F. Klein, Columbus, Ohio, Iass'igior to Frankenberg Bros., Inc., Columbus. Ohio, a oo rporation of Ohio Application september 1s, 1943, serial No.' 562,939

6 Claims.

The present invention relates to the manufacture of paperboard cartons or containers 'and is especially directed to the manufacture of collapsible or knockdown cartons or containers in- 4-which an inner lining is used to enable the package to-be employed for sealing the contents to preserve the latter against deterioration or loss.

It is'an object of the present invention to prof vide an improved methodA for facilitating the manufacture of lined paperboard .containers of the character set forth, whereby to reduce manufacturing'costs and utilize, with but slight modication, `existing machinery now in general. use.

Another object of the invention is to providean improved method of producing linedl paperboard boxes in which the lining material rprojects beyond certain of the marginal edges of the boxxlbody, so that when the box vis completely folded to enclose the contents thereof, such projecting portions of the lining may be brought into sealing engagement with each other toprov ide for improved protection of the contents of the lbox and, when'pulverulent materials are positioned in the box, to prevent sifting of such materials exteriorly ofthe box.

A further object of the invention rests in the provision of an improved method for manufacturing the blanks from which said lined paperboard boxes are formed in which strip-like areas are removed from the blanks 'in order to provide for the projection of the lining 'material beyondthe edges of the blank.

For a further understanding of reference is to be had to the following description and the accompanying drawings, wherein:

Fig. 1 isa flat layout` of 'one form of blank used in forming cartons i'n accordance with the pres-j ent invention;`

Fig. 2 is a similar viewdisclosing lining sheets appliedadhesively to one face of the blank shown Fig. 3 is a view of gions thereof;

Fig.' 4 is a fiat layout box-forming blanks, looking toward its unlined face andshowing by broken -lines the folding creasesof vthe blank;

Fig.`5 is averticaltransverse sectional -view taken through the multilpile blank on the plane indicated by the line V--Vof Fig. 2; 1 'v taken on the plane Fig. 6 'is4 a. similar view VIe-Vlot' Fig. 3:' i'

Fig. 'l is a perspective the initialfolding thereof kto '6 Fig. '1: f

the invention,

tneblank renewing its-cua; ting to 4separate the individual box-forming reof one ofthe Aindividualview' showing lan indi-A (ci. eis-se) rectangular shape and prior to the closure of its end flaps; Fg. 8 is a horizontal sectional view taken on the piane indicated by the lille' VIIf-VHI of Fig. 9 is avertic transverse sectional view takenthrough the box or container and showing in full lines the -position of the end aps prior to final sealing, and in broken lines .the positions 10 of the end naps after final sealing;

Fig. l0 is a diagramm -tic view illustrating apa multiple, substantially the reference charac,-

ing. regions, indicated by l of! such initial ters-A, B, C and D. vAt the time cutting, the iblank may bescored or creasecl as 3.0 indicated by dotted lines in Figs.'1 and 4 which, as usual, define the panels and flaps and facilitate the folding of the blank in the formation of boxes therefrom. The blank is of sufcient width so that at each side thereof there is provided an elongated and narrow strip-'like penits the blank to be engaged by the feeding and guiding instrumentalities employed in automatic box-making machinery. These strip -region's are later removed from the blank at the. the box formingregions, as

40 time oi' severance of indicated in Fig. 3.

Following the formation of the blank shown in Fig. 1, there is applied to one face thereof one or more sheets, indicated at IB, of. lining material. Usually this material comprises a thin Cmoisture'-resisning and fat-repelling substance, suoli as parement, various synthetic films, Cello'phane, `waxed 'paperl or preferably effected by applying to the stock, the lining, or both, a heatsoftening adhesive,.such as wax, `parain or 'an adhesive composed princi- Vpally ofl the, latter I x'iaterials.v I have used advantageously an adhesive point of the order of 160 to 165 Fahr. The adof th'e'present invention arey v rectangular, paperboard blank I4 is initially die out so that it will possess aplurality of boxform region I5 which their equivalents Theunion ofthe lining with the' paperboard stock is Y which has a melting "24, thel flaps '21 being united with the panel I9 hsive, preferably, is uniformly and thinly distributed over the meeting surfaces of the paperboard stock and the lining and, with the] application of heat andpressure, the lining adheres iinnly to the paperboard stock and becomes, in eil'ect, a component part thereof.

InFig. 2, I have shown the paperboard blank I4 as having applied thereto a pair of spaced lining shts. This is' done in order to save the 1ining material, but it will be understood that,- if desired, a single sheet of lining material may be appliedto each of the multiple blanks. This will depend upon the construction of the con-@ tainers formed from the blanks.

Following the application of the lining sheets, the laminated blank is then fed back through an automatic press and the cutting of the blank to sever the individual box-forming sections is acconiplished, such severing taking Place along the lines indicated at X and Y in Fig. 3. At thesame time, the strip-forming' regions I5 are removed, vthe severed 'blank 'possessing theV conilguration illustrated in Fig. 3.

After the strip regions I5 have been removed, there is provided at the sides ofthe blank, shown in Fig. 3, additional severed strips indicated by the numeral Il, to one face of. which the lining sheetsare united adhesively, and in a subsequent operation, performed on the individual blanks, the strips i'l are removed fromthe blank body `but without removing the area of the lining sheets immediately adjoining such strips. That is, as shown in Fig. 6, at the time of severing the multiple blank to produce separate box-forming blanks, the multiple blank body is cut to form the strips l1. This cutting extends through the paperboard body 0f the blank but not into the lining sheets. When the individual blanks are fed through a folding machine, the strips VIl are heated to soften the adhesive uniting the same with the lining sheets, and, preferably by suction forces and following such heating, the strips i1 are removed from engagement with the lining leets and the blank bodyas illustrated in Fig.

In order to form the particular box illustrated, each of the blanks A, B,` Cv and D, which are duplicates, is creased or scored (see Fig. 4) to` provide a front panel i8, and a rer panel I9, and side panels 29 and 2|. The front panel Il is joined with theside panels 2l and 2l along the scored or creased lines 22, and the rear panel i9 is Joined with the side panel 20 along the scored r or creased line 29. The front panel is provided 55 with end naps 2l, the flaps being foldable along A the scored lines indicated at 25.. Also, each of the endv flaps 24 is longitudinally scored asl at 29 intermediately of its width. The rear panel i9 is also provided with end ilaps2l vwhich possess approximately one-half the width of the flaps along the scored fold lines 29. The side panels. and 2| are each provided with end flaps 29 which are foldable about the scored'rlines 30. Also, each of the naps 29 is triangularly scored as at Il to produce the regions indicated at32, ll Yand 34 which, when the container is folded and sealed, are -adapted to overlap each other,that is the regions I2 and 9| overlap the region 33. By virtue of the open ings shown at 35 in the multiple blank of Fig.- 1, the complemental marginal recesses 3l and the .removal of the strips, IB and i1, it will be noted, e by reference to Fig. 4, that thelining sheet 01.75

ascenso each blank projects beyond the margins of the e'nd flaps 21 and 29 and the rear panel I9, forming at the side of each blank a border 3l which, as shown in Fig. 8, seals the interior of the con-I tainer by overlapping adjacent portions of the lining and which are adhesively united.

The side panel 2i and theadjoining end aps 29 are provided withglue laps 38 which, as shown in Figs. 7 and 8, are glued to the rear panel i9 and lits adjoining end ilaps`21. This operation is carried out by passing the blanks shown in Fig. 4.

through a standardstraight line folding and gluing machine which causes the blank to assume the partially folded` form illustrated in Fig. 7, the end flaps at the bottom of the box being folded prior to the insertion of materials into the box andthe top aps folded after the materials have been placed in the box. The extended portions of the lining sheet which project beyond the end flaps, as illustrated in Fig. 7, are adapted to be brought into abutting engagement, as shown in Fig. 9. 'I'hese abutting portions of the lining sheet may be united by a heating operation in which the wax or resin adhesive is softened to enable the contacting surfaces of the lining to adhere to each other and thereby seal the contents of the box.

The folding or gluing machine is provided with a longitudinally extending guideway, not shown,

through which the blanks are advanced longitudinally by any suitable means. Along the guideway, there is arranged a stationary electrical heater 39 Aand a suction roll l0, which roll is 'of a width corresponding to that o the strip region IL of the blank. As the blank passes through e the guideway of the' machine, the strip ii thereoi' passes over the roll 40. As the blank passes through the guideway of the machine, the strip' I1 ofy the blank moves beneath the elongated heater 39 and, by the operation of the latter, theadhesive between the strip .I1 andthe lining is softened. Therefore, when the strip il passes into engagement with the suction roll 49, suction forces are exercised-on said strip to removethe vsaine from the associated areas of the liner, thus leaving the lliner attached tothe body of the blank so that it may form the inner lap or border shown at 31.

' In view of the foregoing, it will be seen thatl I yhave provided an improved method for producing an inner lined paperboard box in which the operations of forming the box may be carried out with existing machines and withya rapidity and economy favorably comparable with that of standard unlined boxes. The construction of the top and bottoni flaps, after the carton is heat sealed, is such that nothing but the liner contacts the enclosed contents, the liner being moisture and grease resisting, seals the contents against vdeterioration by such forces.' The carton offers the same' protection to the contentsas if the latvter were placedin separate heat sealed bags with the latter positioned inside of standard folding boxes.

I claimt 1. In the manufacture of inner lined paperboard boxes, the steps-which comprise applying to one vside of a box-forming blankthrough use of a heat-softening adhesive a lining, sheet, locallycutting through the body4 ofthe blank e but-not the lining sheet to Provide a strip adapt? ed for removal fromlthe .blank but temporarily heldin connection with the latterby said sheet. passing the blank lcngiuidi'nallythrough s guidetening adhesive a in connection with` the ing aplurality of box-forming regions,

ases, 42s

wat',- during 'the passage of theblank through said guideway and without interrupting the movement thereof subjecting the blank in the region of -said strip to the action of vheat of suilicient-.tentperature and duration tosoften the adhesive uniting the strip with said sheet, and

'3 softening adhesive an innerlining sheet, again cutting the blank and lining sheet to separate individually the box-forming regions, simultanethereafter and during continued travelof the blankalong the guideway vapplying pneumatically induced suction forces to the'strip to effect its complete separation'from said blank and sheet.

- 2. In the manufacture'of irnner lined paperboard boxes, the methodsteps which comprise die cutting a,- substantially rectangular paper board blank to provide a plurality of box-formleach of saidregions of said ously with said second cutting operatnncutting blank but not the lining sheet to provide a removable body,there after heating said body to soften the adhesive Vuniting the same with'said sheet, and following the softeningof the adhesive removing the body from association with said blank and sheet.

5. In the production of folding carton blanks from a sheet of paperboard having a sheet of a lining .material secured thereto by means of a ing regions having slotted margins, atlyzsecurn ing to one side of the blank by use of a heat sofforming regions, and removing a marginal strip from each of said blanks to project beyond the margins of said blank.

liningshe'et, thereafter cuty ting the blank to separate individually the boxfor removal from the'blank to cause .the lining sheet 3i In the manufacture .of folding innerlined vpaperboard boxes, the methcd steps which comprise cutting paperboard to produce abox-forming blank, applying to one face of said blank through. the use of aheat-softening adhesive a lining sheet, again cutting the paperboard but not the lining sheet to produce a body adapted for removal from the blank but temporarily held ing the blank in the region of said body to soften the adhesive uniting the 'body with said sheet, and thereafter removing the body from said sheet. 4. In the manufacture of inner lined paperboard boxes, the methodwhich comprises die cutting paperboard to provide a blankcontainatly securing'to one side of the blank by-use of a heatheat-softening adhesive, the imprciement which comprises cutting through said paperboard sheet along selected lines within the confines of each of said blanks without cutting the lining materialv thereon, whereby to produce a body adapted but temporarily held in connection with the latter by said sheet, 'locally heating 'theblank in the region of said body to soften the adhesive unitiig the body with said sheet, and with the adhesive in a, softened state removing the bodyfrom said sheet.

'.30 latter by said sheet, heaty removal from the blank but temporarily held in ing sheet.

6. In the Aproduction of folding ocarton blanks from a sheet of paperboard having a sheet of a lining material secured thereto by means of a heat-soften adhesive, the improvement lwhich comprises cutting through said paperboard sheet along a line parallel and adjacent to its marginal Vedges but without cutting the lining material thereon, whereby to form a strip adapted for connection with the latter by said sheet, softening the .adhesive uniting said strip with said lining sheet, and while softened state, removing the stripirom the lin- CLARENCE F.

the adhesive is in a 

